package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * 菜品业务层实现类
 */
@Service // 加入Spring容器
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired // 注入菜品持久层对象
    private DishMapper dishMapper;
    @Autowired // 注入口味持久层对象
    private DishFlavorMapper dishFlavorMapper;
    @Autowired // 注入套餐菜品持久层对象
    SetmealDishMapper setmealDishMapper;
    @Autowired
    SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        // 创建菜品实体对象
        Dish dish = new Dish();

        // 拷贝属性
        BeanUtils.copyProperties(dishDTO, dish);

        // 调用持久层, 向菜品表插入1条数据
        dishMapper.insert(dish);

        // 获取插入菜品后的主键值
        Long dishId = dish.getId();

        // 获取新增菜品中的口味集合
        List<DishFlavor> flavors = dishDTO.getFlavors();

        // 集合不为空并且长度大于0
        if(flavors != null && flavors.size() > 0){
            // 遍历口味集合
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
        }

        // 调用持久层, 向口味表插入菜品的口味数据
        dishFlavorMapper.insertBatch(flavors);
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional // 事务
    public void deleteBatch(List<Long> ids) {
        // 遍历菜品id集合
        for (Long id : ids) {
            // 调用菜品持久层查询
            Dish dish = dishMapper.getById(id);
            // 判断当前菜品是否是起售中的菜品
            if(dish.getStatus() == StatusConstant.ENABLE){ // 判断是否为启用
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前菜品是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);

        if(setmealIds != null && setmealIds.size() > 0){
            // 当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 遍历菜品id集合
        for (Long id : ids) {
            // 删除菜品表中的菜品数据
            dishMapper.deleteById(id);
            // 删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        // 创建菜品实体对象
        Dish dish = new Dish();

        // 拷贝属性
        BeanUtils.copyProperties(dishDTO,dish);

        // 调用持久层, 修改当前菜品基本信息
        dishMapper.update(dish);

        // 调用持久层, 删除当前菜品原有口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 重新插入当前菜品的口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     *根据id查询菜品和对应的口味数据(用于修改菜品时的回显数据)
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {

        // 调用持久层, 根据id查询菜品信息
        Dish dish = dishMapper.getById(id);

        // 调用持久层, 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        // 创建VO对象
        DishVO dishVO = new DishVO();
        // 拷贝属性
        BeanUtils.copyProperties(dish,dishVO);
        // 传入口味数据
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        // 分页插件, 算出当前页的坐标
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
